/*
 * =============================================================================
 * Copyright by Benjamin Sempere,
 * All rights reserved.
 * =============================================================================
 * Author  : Benjamin Sempere
 * E-mail  : benjamin@sempere.org
 * Homepage: www.sempere.org
 * =============================================================================
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package org.sempere.commons.reflection;

/**
 * Helper class that provides methods to work with java reflection.
 * 
 * @author bsempere
 */
public final class ReflectionHelper {

	/**
	 * Private constructor<br>
	 * This class must not be instantiated
	 */
	private ReflectionHelper() {
	}

	/**
	 * Indicates if the given class exists in the current class loader
	 * 
	 * @param className the name of the class to be found
	 * @return boolean
	 */
	public static boolean exists(String className) {
		boolean res = false;

		if (className != null) {
			try {
				Class.forName(className);
				res = true;
			} catch (ClassNotFoundException e) {
				// Nothing to do here
			}
		}

		return res;
	}

	/**
	 * Indicates if a class is a subclass of another
	 * 
	 * @param childClass
	 * @param parentClass
	 * @return boolean
	 */
	public static boolean isSubClass(Class<?> childClass, Class<?> parentClass) {
		boolean isSubClass = false;

		if (childClass != null && childClass.getSuperclass() != null && parentClass != null) {
			if (childClass.getSuperclass().getName().equals(parentClass.getName())) {
				isSubClass = true;
			} else {
				isSubClass = isSubClass(childClass.getSuperclass(), parentClass);
			}
		}

		return isSubClass;
	}
}
